/*
* $Id: AccumulatorComponent.java 19191 2010-08-25 21:05:23Z tcarlson $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.example.scripting;
import org.mule.api.MuleEventContext;
import org.mule.api.lifecycle.Callable;
import org.mule.api.transformer.TransformerException;
import org.mule.config.i18n.MessageFactory;
import org.mule.util.NumberUtils;
/**
* Component which accumulates successive numbers, by adding/subtracting/multiplying/dividing.
*/
public class AccumulatorComponent implements Callable
{
/** Operation to perform: "add", "subtract", "multiply", "divide" */
private String operation = "add";
private double accumulatedValue = 0;
public Object onCall(MuleEventContext context) throws Exception
{
Object msg = context.getMessage().getPayload();
double data = NumberUtils.toDouble(msg);
if (data == NumberUtils.DOUBLE_ERROR)
{
throw new TransformerException(MessageFactory.createStaticMessage("Unable to convert message to double: " + msg));
}
if (operation.equalsIgnoreCase("add"))
{
accumulatedValue += data;
}
else if (operation.equalsIgnoreCase("subtract"))
{
accumulatedValue -= data;
}
else if (operation.equalsIgnoreCase("multiply"))
{
accumulatedValue *= data;
}
else if (operation.equalsIgnoreCase("divide"))
{
accumulatedValue /= data;
}
else
{
throw new TransformerException(MessageFactory.createStaticMessage("Operation " + operation + " not recognized"));
}
// no auto-boxing
return new Double(accumulatedValue);
}
public String getOperation()
{
return operation;
}
public void setOperation(String operation)
{
this.operation = operation;
}
}